The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Pompeii's less famous neighbor is still revealing her secrets.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

This sculpture honors the man who was known as the "Righteous Among the Nations."

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

Atop this former dutch railway office sits an interstellar work of art.

Europe's official "zero-level," the equator of elevation.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An architectural oddity hides in plain sight on this iconic London bridge.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Ship-sized kinetic sculptural fantasy.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.